Hi akla,
I think this is might help. Found in 1976 Betty Crocker Cookbook copyright 1969, pg 163 listed All Time Favorites as a footnote to Old Fashioned Chocolate Fudge.
Old Fashioned Chocolate Fudge
2 cups sugar
2/3 cup milk
2 oz unsweetened choc or 1/3 cup cocoa
2 tablespoons corn syrup
1/4 t salt
2 tablespoons butter or marg
1 t vanilla
1/2 cup coarsely chopped nuts if desired
Butter loaf pan 9x5x3 inche Combine sugar milk choc corn syrup and salt in 2 quart saucepan. Cook over med heat stirring constantly until choc is melted and sugar is dissolved. Cook stirring occasionally to 234 degrees on candy therm ( or until small amount of mixture droppped into very cold water forms a soft ball which flattens when removed from water)
Remove from heat add butter Cool mixture to 120 without stirring (bottom of pan will be lukewarm) Add vanilla beat vigourously and continuously 5 to 10 min with wooden spoon until candy is thick and no longer glossy. ( mixture will hold its shape when dropped from spoon) Quickly stir in nuts Spread mixture evenly in buttered pan Cool until firm cut into squares. VARIATION PENUCHE : SUBSTITUTE 1 CUP BROWN SUGAR (packed) FOR 1CUP OF THE GRANULATED SUGAR AND OMIT CHOCOLATE. GOOD LUCK !!